The Diadem Whorl Shell is a very beautiful specimen of its genus; it
is marbled with white upon a yellow ground, but the markings become
nearly obliterated by age: it is as much as seven inches in length, and
is found in the Asiatic seas. The head of the animal of this shell has
two pointed tentaculæ, with an eye at the outer base of each. Its mouth
is a lengthened cylindrical and retractile tube, furnished with little
hooked teeth; it has also a tube to conduct the water to the branchiæ,
springing out obliquely behind the head.